Across the country, millions of Australians of all ages, play video games every day. They're among hundreds of millions of gamers across the world. Growing research shows many gamers struggle to switch off and can find themselves hooked on their virtual universe. The discussion about gaming and whether it can cause harm is often reduced to a simplistic debate. On Monday Four Corners goes deeper, bringing together gamers, major industry players and psychologists in an investigation that reveals the manipulative techniques used in many games.